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Sirt1-/- cardiomyocytes showed down-regulation of L-type Ca2+ channel α1c subunit (Cav1.2) and sarcoplasmic/endoplasmic reticulum Ca2+ ATPase 2a (SERCA2a), but up-regulation of Ca2+ /calmodulin-dependent protein kinase II and NCX. In conclusions, these findings suggest that deficiency of Sirt1 impairs the regulation of intracellular Ca2+ and Na+ in cardiomyocytes, thereby provoking cardiac dysfunction and arrhythmogenesis. © 2020 The Authors. Journal of Cellular and Molecular Medicine published by Foundation for Cellular and Molecular M
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